Less ugly balun (RFI choke)

This is an alternate take on the ugly balun/RFI choke. I don't like random pipes and wires and equipment hanging around haphazardly.

Eventually I made some real baluns and this made it into the "abandoned projects" bin, but it was a good temporary solution.

The part is made to fit 12 turns of RG58 coax, which is also used as a thread. The caps are threaded with half the coax diameter, and the body matches the other half. You can likely build this with spare parts from the shack: an UHF connector, coax, spare PLA. 

External diameter is 75mm at coax center, and the coilformer has 12 loops, so you will need at least 3m of cable. 

Assembly:

1. Pull 20-30cm of coax, from the outside of the coilformer, through one of the two holes. This is where it connects to the UHF cap. 
2. Twist the coax three times. Screwing the cap will untwist it.
3. Solder the coax to an UHF connector. 
4. Screw the UHF connector to its cap.
5. Pull the coax outside the coilformer, screw in the cap. 
6. Pull the other end of the coax through the opposite coilformer hole, then pull the cable through the other cap
7. Coil the coax on the coilformer. Adjust as needed through the exit hole
8. Screw down the other cap.

Connect as you see fit. You can either add terminal blocks/wago/etc on the free end of the coax to hook up your antenna, or you can add an UHF cable jack to it – hook it up to your rig - and use a patch to connect to the antenna.

Mind the distance! Ugly baluns (RFI chokes) should be near the antenna. The caps are symmetrical, so you can also print two UHF caps, or two blank caps. 

Results were nothing out of the ordinary, but it did kill all my RFI problems and I managed to capture some more signals on FT8.